Walking is good for the elderly, but young people should be aerobic and anaerobic. If you don't want to move, I have an idea:

Drink a bowl of soybean milk and eat an egg in the morning; Eat two dishes and a millet porridge at noon; In the evening, either a dish of porridge or two packs of yogurt. I eat apples when I'm hungry, but I'm basically not hungry and basically don't exercise. You just take a walk after dinner.

You can lose 6- 10 kg within this week. I've been there myself. I hope it helps you.